Castrol R40 is a castor-based lubricant containing specially prepared additives to prevent rapid deterioration through oxidation. Its superior oiliness over mineral oils, imparted by the chemical structure of its components, gives it a great affinity for hot surfaces and provides excellent load-carrying properties which is an important consideration with highly stressed engines running at peak revolutions.
Recommended for highly stressed engines running at peak revolutions. Also recommended for classic motorcycles. Where special cam shafts are fitted though, there may be a case for using Castrol R40 as the small areas in contact will be heavily loaded especially where double valve springs are fitted.
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